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When installing ArcGIS Desktop or when starting ArcMap and/or ArcCatalog, the following error displays:
"Error 1904: Module C:\Program Files\ArcGIS\Bin\DataGraph.dll failed to register".
This error may be displayed for a few different reasons.
The following is a list of the most common solutions to this problem; however, if the first two solutions do not the work, the third solution should, although it has the most impact on time and resources.
Note: Try running a repair on the Windows operating system before reformatting and reinstalling, but the Windows repair may not work.